The AQ6370B uses a newly developed high performance monochromator to achieve high wavelength resolution (0. 02 nm) and wide close-in dynamic range (70 dB). With the sharper spectral characteristics of the new monochromator, OSNR measurement of 50 GHz spacing DWDM transmission systems and EDFA. Test Equipment Solutions Ltd specialise in the second user sale, rental and distribution of quality test & measurement (T&M) equipment. We stock all major equipment types such as Spectrum Analyzers, Signal Generators, Oscilloscopes, Power Meters, Network Analyzers etc from all the major suppliers. The Yokogawa AQ6370B Optical Spectrum Analyzer redefines measurement excellence. : A1006WD), maximum rated voltage: 125 V VDE standard power cord (part no.